Lamar Technologies CA 1550 - Manual (Page 14)

3. OPERATING GUIDE - CHARGING
K. SWITCH AC POWER OFF
Switch the AC on/off switch off before removing the battery.
NOTE: If in emergency it is required to stop
charging, switch the unit to off. When charging is
restarted the timer is reset to zero. It may be
necessary to adjust the parameters (current and
time) before resuming charge.
CA-1550 CHARGER / ANALYZER - OPERATING MANUAL V1.2 Page 12